It’s the most out of control he’s felt in his whole life. The most free. Because what else could possibly matter if Stiles were hurt? What wouldn’t he do?
He almost fucks up. He knows that. He did fuck up, really. It was stupid, to do that in front of everyone. To lose his temper. Jackson’s not the type to tell if no one sees- would love to walk around with black eye, actually. Let everyone assume he’s a badass. Derek thinks about making that his next step. Finding Jackson after lacrosse practice and beating the shit out of him. One black eye. A few good punches to the kidneys.
But he slams Jackson up against the locker instead. Puts a bruise on his face and cuts into the back of his neck. Derek gets blood under his fingernails, and spends a half-hour picking it out under the watchful eye of the office temp until Peter gets there. He really feels like scraping it out with his teeth.
When they’re finally in to see the principle, Derek mostly tunes them out. Jackson’s hurt, sure, but he hurt Stiles first. He hurt Stiles more. The sound Stiles’ head made when it hit the metal- he could have gotten really hurt, he could have died.
There’s a moment of silence when Derek realizes he said that out loud.
-Multipied by Seven by 1001cranes, [For one of my absolute favorite universes in the Teen Wolf fandom (Psychopaths in Love)].